Omit templates on own class template names

Example:  https://doc.qt.io/qt-6/qspan.html#QSpan-2 (in case the docs got updated in the meantime: this is the QSpan move ctor) should be rendered like this:

QSpan::QSpan(QSpan &&other);

not, like currently

QSpan::QSpan(QSpan<T, E> &&other);

Rationale: cleaner, because shorter and less confusing (the class template arguments are shown only once, in small print, at the top of the page), esp. compared to the constructor from a differently-sized span, https://doc.qt.io/qt-6/qspan.html#QSpan-1: The listing atm shows

QSpan(QSpan<S,N>);
QSpan(QSpan<T,E> &&);
QSpan(const QSpan<T,E> &);

which is confusing, compared to

QSpan(QSpan<S,N>);
QSpan(QSpan &&);
QSpan(const QSpan &);